Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
ve triet » va trien, su triet
thanh vi » hanh vi, thanh va, thanh ve
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
su tien » su kien, su hien, tu tieng
nang co » nang cao, nang doc, nang noi
ty nang » ky nang, ty xang, ty hang
va dau » va dao
va cau » van cau, va cac, va cao
co loi » co hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang co loi. hieu ((va cau) OR (va dau)) thuc vat thanh vi ((ve triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang co loi. hieu ((va cau) OR (va dau)) thuc vat thanh vi ((ve triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang co loi. hieu ((va cau) OR (va dau)) thuc vat thanh vi ((ve triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang co loi. hieu ((va cau) OR (va dau)) thuc vat thanh vi ((ve triet) or (su tien))*.